MAYBE
239.07/77.70	MAYBE
239.07/77.70	
239.07/77.70	Problem:
239.07/77.70	 a(a(a(b(x1)))) -> b(a(a(a(x1))))
239.07/77.70	 b(b(x1)) -> a(b(a(b(x1))))
239.07/77.70	
239.07/77.70	Proof:
239.07/77.70	 Open
239.07/77.71	EOF